DeVille DHS V8-4.6L VIN Y (2000)
Air Bag: Description and Operation
Rear Side Impact Air Bag System Description (Option AW9)
The rear side impact air bag system is made up of some components that are use in the side impact air bag system. The rear side impact air bag system
consists of the following components:
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Two Inflatable Restraint Side Impact Sensors (SIS) (one in each lower center pillar).
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Two inflatable restraint rear side impact inflator modules (one rear side air bag in back of rear seat).
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An inflatable restraint Sensing and Diagnostic Module (SDM).
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An AIR BAG Warning Lamp in the Instrument Panel Cluster (IPC).
The inflatable restraint side impact sensor (SIS), inflatable restraint rear side impact inflator modules (Rear Side Air Bags), inflatable restraint Sensing
and Diagnostic Module (SDM), and the connecting wires make up the rear side impact inflatable restraint system. The SDM contains a sensing device
(accelerometer) that converts vehicle velocity changes to an electrical signal. The SIS is treated as a discriminating sensor and is a input to the SDM. If
the SIS determines that the side air bags should be deployed, the SIS tells the SDM to deploy the front and rear side air bags. The SDM will then check
to see if there is enough vehicle acceleration to warrant a deployment. If so, the SDM will send current to the front and rear side air bags. Deployment
occurs when the SDM receive vehicle velocity changes through the SIS that are severe enough to warrant deployment.
